Android Training Course (21)

I learned how to initialize and load the property system and save it to the property file. Next I will learn about the Attribute Service. It is mainly used to provide a service for the upper layer of the Java Virtual Machine, or use java applications. The code for the start_property_service function is as follows:

#001 int start_property_service (void)

#002 {

#003 int fd;

#004

#005 load_properties_from_file (PROP_PATH_SYSTEM_BUILD );

#006 load_properties_from_file (PROP_PATH_SYSTEM_DEFAULT );

#007 load_properties_from_file (PROP_PATH_LOCAL_OVERRIDE );

This code is used to load the following default attribute files:

/System/build. prop

/System/default. prop

/Data/local. prop

 

#008/* Read persistent properties after all default values have been loaded .*/

#009 load_persistent_properties ();

This line of code is used to load attributes saved as attribute files.

 

#010

#011 fd = create_socket (PROP_SERVICE_NAME, SOCK_STREAM, 0666, 0, 0 );

#012 if (fd <0) return-1;

#013 fcntl (fd, F_SETFD, FD_CLOEXEC );

#014 fcntl (fd, F_SETFL, O_NONBLOCK );

This code is used to create a service socket and set the corresponding attributes.

 

#015

#016 listen (fd, 8 );

This line of code enables the property service to enter the listening status.

 

#017 return fd;

#018}